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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2d2cdee5b1eb1b63766b67b7366bd7eb6cbc634cd259d10506203e5cec3c37d' 
  AND token = 'OEmXJXRAq0ftpxhJtHF3fpJna0x0iCYDJMMpCye/1A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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