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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd454ebed1f5b8314c35d8d024be7bf5ab5e15db4c55d676e71251217236034cd' 
  AND token = '50hdJOslFEMzvWOhtcFQAtVhQ8USiTZ7H5842LIxdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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