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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c73c33e5e259caad3e59d0a473101f11faf5f0aaa62a40164e1f5570c4bf564f' 
  AND token = 'zViCS5EfWtPN4Iq5ItrESVsM1fUkjgFk3ytc+DZVxGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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