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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c1769c8034c09ca827909430ff03ff309a27b350b789c0be91e4f7c1d740168' 
  AND token = 'xkhzbDgQ/R9PN+srHj9dB7H+zRWfnEAsHg0qpboX6tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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