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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47ac695ea1196ce1318ef9a2c820f1004fc4c0762c702770e869f0be44764220' 
  AND token = '7mYVTvk0NWArD9Sr+2wuxkeWZQn1RP0zw7IGXMqRaMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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