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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a854a3f96e587073aef5a28e7e4c2009409e532fdc59915efe932349c7c2b7d8' 
  AND token = 'kf9UkqUJlk4rZLO5YqBEey3tFkZXQM5t0t1/TvibzFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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