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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ae55eca182ccd1fc8a606e9b67890a6b2ddb9fb00d3b0c14b1082502add552' 
  AND token = 'Pku9B+/NfiroWOidC7xDWiN3InoBGx3EcEBAGm+oOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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