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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '371731c70e971224d9dff8a0677d5f0d68981639180bcf71624f832ab587b23f' 
  AND token = 'rNIp74lNbkME7jw5kXzYdmYc2qN2+5bAszz7RrLx0x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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