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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e250a6ec0ed61246906b2ad81f44781c03a44827e0b924266b2ac489893c4f4a' 
  AND token = 'fks5R9v3J1Xjc40x38uPTEa3NcF1hx92seB1KjzBi4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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