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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0176bd14dceeb406c18d0179f86bc33232d4cc5702760b156648aa0d82ba0ef0' 
  AND token = 'zeNMUSUfsFePFRH4Zh24dM5ALZ7/Aw3ZLMHyujtOfhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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