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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7935b00b711d3a66c04098491a9bdbedbc84e6d224a64b8615f15fbc04279536' 
  AND token = 'xffcooWmBOEZLNXTIHQAC190ZbCJbGewUa9i2hD4lJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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