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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a2c64c5fb3266e56f603a71a2ac57e0179caeff4d08ed1d03661189cc0c6bb6' 
  AND token = 'u7r5ANpmrlX13PhN96JSJLOfGYtDtY1MCJHRnWXeLjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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