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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e31fddb6253fa0f88abcfbb312920292b5d5381304eb850d3f08a7c377ae1876' 
  AND token = 'u1RFpeEiitH7fy9Kl2Aq7N5H1D3PMARQItOPMQcn+To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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