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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0621c4ae82b69c39238ac44f5c04d49c32fb4c32a270ea5cc79c968d3c492019' 
  AND token = 'Rsxec3Ewp4LLVcUNBsSv0EyvkLexwOTprxz3m+1GmLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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