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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53f890ef5012c9e7cb11378fa1cf61e13d42319b2f50249d4ea8cc5381f0d3c6' 
  AND token = 'uzqlO63Y9NzSTJ+f/87fKf9IXD3FV6zEOfs4asTXUew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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