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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac3e9b9e389d4f0af791cc33d3a66b37dce00437abd5817ff45fad88c53c1d9' 
  AND token = 'F95YdtKbHdaZTUkkLXp23x4mpQNb6XIY388V1+5YMmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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