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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8677f42e135ab102d92cf494577d1e29235471795e44f161d06e91cf9c50c3df' 
  AND token = 'OTI0yC3W7eGyp7dIClE3SRsi7azh8xQpmQESz1Ex0Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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