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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba1b5832a0f7b7a851b22d662b06ae5c1f6e2be3fdc5a7a46fa76bf50c01d90c' 
  AND token = 'lDw0I7Qau1FuZeK7w7yJ+blv7HU1RwZ8grKRTjeS3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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