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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9af677903c54762c479a28eaafee94c9965922e0c8491cd1d9cec8ebf56d43cf' 
  AND token = 'x/3qqBPWLOgjNx0/20n1IaDV8jq0/4spcy25E7AJ+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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