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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52f2f583fe034a2c19045ab68a2e39de35c353e12a74cf635bfc0ee978d01234' 
  AND token = 'P9eICa46JkNKC9fMr4d5aR4DnPVp3kHALMMvKRKlAG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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