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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34fdefccad247f6e67077e5b0f9a62ed326f7bf92cce1a0de1abf618f77efd23' 
  AND token = 'aafcxun9CqMVP2Z3K6bocnLkYDre30c3Thcr37YIeuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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