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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794ac80fc5aba08c2533db5e3c4d1e6619e4ba2a4afe6fbe9cf8cefaeb2ae383' 
  AND token = '1XCKC1cr/2QtXhrZXdKDts3b72VoY8f2XE1Qw3ALe1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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