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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f31a21de80c03e9687c3a077e239e65cefa88590b1d9abc5cf076fc5f9fa2602' 
  AND token = 'ZZ7l/gL2ujpa3YS+/FGF/7dstmonxyZHkrV6l+USIuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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