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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b00a0706146ad0d57de4e83540aa7a808726358488f064df2513a3e6499445d' 
  AND token = 'oTPdTzCAm4tW3wJiyLAC/CSfC+YWJxKfFJ6pYuINxIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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