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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e0ee02f08dd86cc7eb7c310f2e7d25f4372bbf17923b1ffe6ef27c0e4d5b3b' 
  AND token = 'akcYmoQvCvOvtW/QkwgqVqzMxS8MYVNAlyNOdVInsYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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