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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1223ceca925e6c6f98b45302ea0065a3ea4969e1e077f96317031a38183abf8a' 
  AND token = 'J5WoRM/9NOsY4PsXUXtdh0AIHJ40gFBPFNB75YUaXW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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