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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab5678b94e558bd1214ed262c6225217cc587a5c308f9bf08688695a0aca39ab' 
  AND token = '9e2FtgW0BfQjawkCGi35Wt5NRLqSQxQwc3N3b+KRTLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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