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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc99bf1c895dc2199edd7b93ee048aeb8e3378eb9fe410ff6a618103624399e' 
  AND token = 'wl1D5oMialbDVVZRwUVD/O3TBY6KJbakCu9K/rI/cGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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