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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e7a418fe485707c962254db36d11db80d9b6ea64c26d2cf5cae36c6c365fa82' 
  AND token = 'ebIoPpq6S0jHQIQ2bEPI62DdPOQYjfxdlTLc2MXUP6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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