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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ed8a5cd2d5fe012c5d2ee3894c96406933063d112ef762d7b30c8452e6a6fba' 
  AND token = '+rNHHeNPc0eShHibtQE6MENT8nR8AZGv4DZh0gjAcpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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