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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c708aa57880b772854116ca7ef6bd8be1f32a26180aa28b9659d9004e129eab1' 
  AND token = 'yBpmZAkpB8QpHxemITiSoE54BmlnsfL88vLHfiUTTMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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