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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4dcb03201eff5b375b3058fef93db8fef434647052c15be6ef7bc311ce1c58' 
  AND token = 'koKe8kaz1pwuJyQ5Apmp/1CtE/fD0gU1pSYXtGM7E4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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