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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '067cb20d64b44dae6f4a14ee9987c4e99a2889bcbd3c0f531be9ab3f2f7f7614' 
  AND token = 'N69pi1+8U/Vdb1066G3/L32rXGhBVULVMNoAQvU3SF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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