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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b40c98ed46f4e6c88a795294560575bc7611fcceeee1cd673416cb755a4c2189' 
  AND token = 'q4OEVS1ezWYvO0l7n5lBxuEOaxnq+T036QiG40KVGe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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