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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '918b0f3e23c4b9f48ad12e719a6418a27b647356ac2b3f71216cf12c7e2616d8' 
  AND token = 'sTMe54/1vAPSfzOoXnB88AsiqcAMxXKbrbwGrawGyeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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