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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'becd79cf2a65cdfea304d177288511e1e2056b67360e2fd5f88c2a37daa3fa24' 
  AND token = 'ZgXllZHe2ESrFwWETSiKhg/XFtMkqRT5Zsf/Mip4X0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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