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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01685b333dee33b71fe690ebddcb374a78dc5efd21c6c6a9ac9d722c238ecb73' 
  AND token = 'oRZkEkI6eIBfqGA0j2K5pwkimDShba17XczUUsL9mis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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