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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6755c513699a618759b9d2df2ffe67d571fc1bc1bd3709b917520d7cd44d7a61' 
  AND token = 'XAHKoMV6d7MvVzeCCtRlaPwLhEXFzQax51Cp01CPsog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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