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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb62e4f23b2f78fef4ca2f6024c7200031a20759afd79411d50fc1bfede154d0' 
  AND token = 'RKgPL9GyvRcP0pvbnT8eeeg7egUMTtSKg7hdl0yO9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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