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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a9af6404ac83aa0e479dee1004a38dcde75841b3a79e5a0698b620fb877e13' 
  AND token = 'N48G1IxbJ6jT1PINXRk98JvCoePgi01TPY7Nv6ZpsrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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