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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d26b30a10f84b59dd80eee703ec677ab6773ea7d20df0e0c4ede46d46b73d2a' 
  AND token = 'O/TTehN/VQH6+2ogDG4qdiOqGpEzrnQfn20u3KOz7MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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