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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b51cc47e83501b9a6a5f6d2f5e876f8b845634c7e965933271316114aa7c3906' 
  AND token = '5Mfh7AW088SrxV3f0oKHvp5tZyFxiyiYfT0NZ5TM4yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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