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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99affaeda57c0defb25dab76ae2a8f3b5c67f7e420edbb086ca65f8f91c2a0e5' 
  AND token = 'pGRN+0dzHMSEUYxz0Xspsl1mn4jAfsCHLov9nnyXzjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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