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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7122eab6e4e08f1c655acd9abfcfc9f50fc7d3c0427125d664b34c9aad5101c' 
  AND token = 'I2bDxlT+/RE1saVtMru+fVXQv/vYEyCJiiGLbpBDNNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}