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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d50761806357f73c6d2702eb5a182e1dfc4eb33690b2142a2ce1a2793e1f058' 
  AND token = '/bv+i49y36NQoQkPi19kgWvgDOk5e7n3RPWDhfMYw3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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