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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee8f540a0ab205089a14bac9ed098b0d7852a2c4579679ca646061fb6e2d9f14' 
  AND token = 'sqzIfvfRBSFlAM5s9cH1Hhm66X5uK05EqzdU1cMz2fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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