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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20f336be4ae3f19e290624f1ac0a4bde16b9282c4b6727d711461a932ea25d65' 
  AND token = '2ytljr4TCINhBQNtlkKaKs9sVQXXWd6XKA90ERthjEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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