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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '300bdc20b16ef588eb8948441b717daaede0ec01e1334d027b2d3742ae361f1b' 
  AND token = 'vXTuQphHxQyc9EgTH7/Up/h3TkbWphh+ehLDc2kG6OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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