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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4008d1cce146b90222832240be669dc641cac47ab3507a14f7d92a8f359cb911' 
  AND token = 'Qw6Pt0wN6ZW7mfurH/NQkcddgrfUYtN6AT5xsUC5L7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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