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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7404611305167747e56d3e8d134cd34cdddde8b380fcd963f747bec90b219f5e' 
  AND token = '4kS1KmS35KEBii31d1l+5dfJpJQoxF9+e99g7Js47vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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