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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b467cf4bcd7876bb81f6444e42fb691bfc0e0c17e999aed9ce7740f8ed9626d9' 
  AND token = '0cqaRMd6L52TUQM9zG78HNbeHtIt2pbM2jZOqznO5vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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