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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eace6445ef79e0e0a6024ee5cf34948fb86f526aec67e5957ec7884c4c9349a8' 
  AND token = '5Dla6CQGpi/rCRKa9FOvlTZHugR/Cb9z3Bks0hd0YEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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