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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f463d6cfc2d3db5db3500ddacf32a1cad5236cc9e5c48ec9a135e5244682eed0' 
  AND token = 'rOFBmF5uPCUvdTuA1RM2TanI15ItVQYhB1r+7VTnAi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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