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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '387baacd044b97edcf539f4efe20526c0e8d6d195005ae04c3d3b10c3dc22b58' 
  AND token = '6OhiA2P60lzyeOxu4OpEHJy9hlQVtTjsm762J9s1u34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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