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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76289234967eddb73323f93a1d2439f6dc53d43d65b9383efadc39e8458a3887' 
  AND token = 'guflXifY0BFOD1hvI2PtL/cMG7kQm6xi3Qhaq0AlXN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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