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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0697f2c65abc9afc37f5226363a1bd779d988ca6dcce1424a36774d765e8d70' 
  AND token = 'oqT8/74jEhWI9nDSrHWVBxfAJfIkl98KNcfaZqAJByw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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