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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aacfded6192302a2d710eac8e78587deaed8f6cfeb47109ee70d4aa11715a17' 
  AND token = 'wqlluGNj68Byya8pVIN4i9NQoX/SnmGuD1Cbu9kGocQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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