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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9318ae1d305fa01b72f145bb9a96f1b3b6adc435700ebfcee8e73b044cfe61f' 
  AND token = 'cwOQ8y62S0gkCiMDmkv2FaWjZvjAgB7zbF9wvllfxhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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