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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4caa51ee167fb6958394abddcc808c7bc729f4a3fda7ffc067480f4dfe44b6b' 
  AND token = '56C+LTHat+xzsr2cFexDMTg+h7jVg3p9PsycdPwZdok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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